比唔比cheat sheet
比既千奇要寫靚佢呀 靚cheat sheet 好過溫書
唔係得張formula sheet寫咩f=ma咋咩
聽日就考
屌考DSE就返DSE post啦
Double sided cheat sheet
究竟right hand rule點用
FBI
佢無left hand純用右手
但有時又electron要-ve charge
搵direction of force added on Electron 既時候,v係同current相反方向?
唔係有時 係electron就要負,因為velocity of electron同current係相反方向
咁v就係opposite to current?
最尾q又要negative翻?